diff options
| author | David S. Miller <davem@davemloft.net> | 2008-10-01 06:12:56 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-10-01 06:12:56 -0700 |
| commit | b262e60309e1b0eb25d300c7e739427d5316abb1 (patch) | |
| tree | bf319d78c79bb5cb617ff0c8340c73aa349bba15 /kernel/exit.c | |
| parent | 93c8b90f01f0dc73891da4e84b26524b61d29d66 (diff) | |
| parent | 0523820482dcb42784572ffd2296c2f08c275a2b (diff) | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
drivers/net/wireless/ath9k/core.c
drivers/net/wireless/ath9k/main.c
net/core/dev.c
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 16395644a98..85a83c83185 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -583,8 +583,6 @@ mm_need_new_owner(struct mm_struct *mm, struct task_struct *p) * If there are other users of the mm and the owner (us) is exiting * we need to find a new owner to take on the responsibility. */ - if (!mm) - return 0; if (atomic_read(&mm->mm_users) <= 1) return 0; if (mm->owner != p) @@ -627,6 +625,16 @@ retry: } while_each_thread(g, c); read_unlock(&tasklist_lock); + /* + * We found no owner yet mm_users > 1: this implies that we are + * most likely racing with swapoff (try_to_unuse()) or /proc or + * ptrace or page migration (get_task_mm()). Mark owner as NULL, + * so that subsystems can understand the callback and take action. + */ + down_write(&mm->mmap_sem); + cgroup_mm_owner_callbacks(mm->owner, NULL); + mm->owner = NULL; + up_write(&mm->mmap_sem); return; assign_new_owner: |